Are you sure you aren't confusing what would happen if we traded him with what would happen if we cut him from a cap standpoint?

When a player is cut all the guaranteed money (including signing bonus and salaries) are accelerated.

When a player is traded the original team is on the hook for the signing bonus (since it was paid at the time the contract is signed), but the new team is on the hook for other, not yet paid, guaranteed money (i.e. not paid guaranteed salary, workout bonuses, etc).

Chiefs are still on the hook for signing bonus money regardless.

Quote:

A player who leaves via trade, release or retirement before any bonus proration or other guaranteed money have been amortized carries an accelerated cap hit.